MegaDrive Sonic the Hedgehog was released to JP on 1991-06-23. Game Gear Wagyan Land was released to JP on 1991-07-26. So odds are the game is from mid-1991, which doesn't help, because a ton of of 4mbit / 512KByte Genesis/MegaDrive games were released in 1991.

That's definitely a 1Mbyte game, and I don't think there are too many of those with battery saves. Unfortunately there's no Bootgod's database equivalent to MD. Guardiana.net comes closest probably but hosts no sort of hardware info.

You can tell that the game is 1Mbyte by looking at the 4 pins in left. 512KB games have 3 pins, 1Mbyte games have 4, 2Mbyte games have 5 and 4Mbyte games 6. Games with SRAM backup use the 6th line to split the 4MB range into two halves, ROM in first and SRAM in other half. Also the ROM has 42 pins, 512KB ROMs have 40 pins only.

512KB games have 3 pins, 1Mbyte games have 4, 2Mbyte games have 5 and 4Mbyte games 6.

That's pretty cool knowledge! Thanks for sharing!!

I think I'm becoming older and lazier...A while ago I would just buy the game than try to do something with it later.I think this board will really need to be stripped, cleaned, tested and reassembled.I've got a somewhat incomplete list of 8mbit games made by Sega and with SRAM save:

That list, summed with Koitsu assumption that's a 1991 game narrows to Ayrton Senna's game. I'm not totally sure of most of these games release date, so it's just a kind of assumption.

Isn't the 9119 the production date?It could mean 19th week of 1991, or not...Is the serial number (the MPR code, right?) written somewhere inside the ROM??Thanks guys, even if I'm not sure wich game it is, it's being very educational to me!

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